Nemathelminthes Gegenbaur, 1859 see Phylum Nematoda Gegenbaur, 1859 Class Nematoda Gegenbaur, 1859 Subclass Secernentia (Von Linstow, 1905) Andrássy, 1976 Order Rhabditida Chitwood, 1933 Suborder Diplogasterina Paramonov, 1952 see Suborder Diplogastrina Paramonov, 1952 Family Tylopharyngidae Filipjev, 1934